Show save dialog when exiting via shortcut or menu item #5127
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Ctrl-Q on Linux doesn't prompt to save files like the normal window close button, and I managed to lose work several times over it.
Digging into the openscad (and Qt) source code revealed that File -> Quit has the same behaviour, and it most likely happens on OS X too (Cmd-Q).
I'm no C++ developer, but the fix appeared to be relatively simple once I found it.